}
            val errorMessage = "Found non-empty test files dir:\n$nonEmptyDirs"
            if (reportOnly.get()) {
                println(errorMessage)
            } else {
                throw GradleException(errorMessage)
            }
        }
    }

    /**
     * Returns non-empty directories: the mapping of directory to at most 4 leftover files' relative path in the directory.

  "durations" : [ {
    "testProject" : "largeJavaMultiProject",
    "linux" : 1095
  }, {
    "testProject" : "largeMonolithicJavaProject",
    "linux" : 1140
  } ]
}, {
  "scenario" : "org.gradle.performance.regression.buildcache.TaskOutputCachingJavaPerformanceTest.clean assemble with empty remote http cache",
  "durations" : [ {

    }

    private
    fun RichReport.toAssertionMessage(message: String) =
        if (isEmpty) "$message with an empty report"
        else "$message\n${toText().prependIndent("    ")}"

    private
    fun runKotlinBinaryCompatibilityCheck(v1: String, v2: String, block: CheckResult.() -> Unit = {}): CheckResult =

        assertEquals(TaskOutcome.SUCCESS, result.task(":successful-test-with-leftover:test")!!.outcome)

        assertEquals(1, StringUtils.countMatches(result.output, "Found non-empty test files dir"))
        assertEquals(1, StringUtils.countMatches(result.output, "Failed to stop service 'testFilesCleanupBuildService'"))

        return doThrow(
            `path must be a string, but got \`${originalPath}\``,
            TypeError
        )
    }

    // We don't know if we should ignore EMPTY, so throw
    if (!path) {
        return doThrow(`path must not be empty`, TypeError)
    }

    // Check if it is a relative path
    if (checkPath.isNotRelative(path)) {
        const r = '`path.relative()`d'
        return doThrow(

      "coverage" : {
        "per_commit" : [ "linux" ]
      }
    } ]
  }, {
    "testId" : "org.gradle.performance.regression.buildcache.TaskOutputCachingJavaPerformanceTest.clean assemble with empty local cache",
    "groups" : [ {
      "testProject" : "largeJavaMultiProject",
      "coverage" : {
        "per_day" : [ "linux" ]
      }
    }, {
      "testProject" : "largeMonolithicJavaProject",

        model,
        performanceTestCoverage,
        stage,
        bucketIndex,
        "Empty Performance Test bucket $index",
        mapOf()
    )
}

class TestProjectSplitBucket(val testProject: String, private val number: Int, val scenarios: List<PerformanceTestDuration>) : PerformanceTestBucket {